Illustration of a heraldic rampant lion on hind legs, like those found on a coat of arms
Hello all, I have a Scrub Oak tree in my front yard, and I have St. Augustine underneath it. The grass is very thin and I was told that is because oak trees turn the soil acidic. I had lime put down last year but the grass still looks the same.ello all, I have a Scrub Oak tree in my front yard, and I have St. Augustine underneath it. The grass is very thin and I was told that is because oak trees turn the soil acidic. I had lime put down last year but the grass still looks the same.
Fixing Alkaline Soil. One of the best ways to increase acidity in soil is to add sulfur. Adding 1 to 3 ounces of ground rock sulfur per 1 square yard of soil will lower pH levels. If the soil is sandy or has a lot of clay, less should be used, and it needs to be mixed in very well before using.